HARBOUR DESIGN
II
(3) Within a confined Basin of
comparatively small extent, having a
narrow aperture only for the in-
gress and egress of vessels. There
is little to distinguish this from
what is termed a Dock, though
the latter expression is commonly
restricted to basins provided with
entrance gates. An illustration of
this class of harbour is to be found
at Peterhead in the South Harbour __
(fig. 6), while a dock at Sunderland
(North Dock) is shown in fig. 4.
Fishery harbours generally belong
to this class, and it is no un-
common feature to find a smaller
inner harbour, or basin, constructed
in conjunction with a large outer
harbour, or a roadstead. These basins
reception of cargoes.
are provided with quays for the
>000 0 tOOO 2000 3000 4000 5000
Imiluiil -_J ----i ----i ____I____I
Scale of feet
Fig. 5.-—Portland Harbour.
For the purpose at present in view, it will be found advantageous to adopt